Abstract
Summary Examination of axial pulmonary arteries after injection with a barium-gelatine suspension and using serial sections revealed (1), a great disparity between the branching patterns of the pulmonary artery and the bronchial tree due to the presence of numerous supernumerary arterial branches and (2), if the whole branching pattern of the artery is considered, it is clear that the pulmonary artery is dominantly a muscular ‘organ'.
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